Central Texas Angel Network was the fourth-most active angel investment group in the nation during 2013, according a report released Thursday.

The Austin-based investment group was outpaced by the Houston Angel Network, which ranked No. 3. The No. 1 angel group was Golden Seeds, which operates in California, Massachusetts and New York, followed by Southern California-based Tech Coast Angels, the Halo Report indicates.

CTAN, which was founded in 2006, also ranked No. 4 in 2012, and No. 6 in 2011.

The investment group is comprised of wealthy individuals — many of them former entrepreneurs — who invest in startups. They typically contribute up to a few hundred thousand dollars per investment, and the best way to connect with the group, aside from personal connections, is through the “application process” page on its website.

Last year, Texas accounted for 8.5 percent of all the angel investment deals completed nationally compared to 18.6 percent in California, the No. 1 region, the Halo Report indicates.

During 2013, CTAN invested more than $9.7 million in 33 startups, a 21 percent increase compared with the previous year in which it invested $8 million in 28 companies. CTAN’s membership size also grew nearly 40 percent last year, reaching 139 members, Executive Director Brent Elyea has said.

Last year, CTAN members invested in 16 new deals and 16 follow-on investments. New startups funded by the group averaged $292,000 apiece, and follow-on investments in CTAN portfolio companies averaged more than $287,000, the group reported.

The three largest industry verticals for portfolio investments during the year were Internet services (22 percent), consumer products (19 percent), and biotechnology (13 percent).